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When I first got the truck it seemingly ran fine. I didn't notice anything "off" until at least a month after I bought it. I was coming back from a couple hour trip and I noticed one or two misfires on my way back while in 4th gear. I thought it was a fluke so I ignored it. Later on I...

But wouldn't this be the case even when the engine is cold? Immediately after starting the truck I can run the RPMs up as high as I want and there is no misfiring at all. As the engine starts getting warm it progressively gets worse over time. If the valve wasn't closing because of carbon...

I was absolutely convinced I was dealing with an O2 sensor problem since the problem only seems to really happen when the truck enters a closed loop, so this is definitely something to check.

The only issue I have with this is that if it were valves not closing, wouldn’t it be happening all the time? Like immediately after the truck started? When the engine is dead cold the truck runs absolutely perfect for a minute or two, even when accelerating into the trouble range of about...

We replaced all the spark plugs and plug wires. We bought some used injectors but didn’t get a chance to put them on. We started thinking it was an electrical problem we were chasing. The dash lights would dim slightly whenever a misfire was occuring.

We replaced the CPS last night and it didn’t make any difference, unfortunately.

Hi guys, really getting to the end of my rope chasing this issue. So far replaced o2 sensor, tps, coil, spark plugs, fuel filter, distributor cap and rotor, and did a fuel pressure test. Nothing has fixed this. It used to only do this at 2900 rpms but now it does it all over once the vehicle...

Hi, I’m interested. Can you PM me some pictures? Thanks

Anybody in the San Bernardino or high desert area? Need help with my Jeep. I replaced the clutch master cylinder today but the return spring for the pedal popped off and I have no clue where it goes or how to put it back on. Based on what I’ve read it isn’t that simple to do. Let me know...

Having a problem with my 91 Comanche Pioneer. 4.0 HO, 4x4, AX-15. When the RPM is sitting just below 3,000 RPM there is a "hiccup" that occurs randomly, but somewhat predictably. I've only been able to replicate it in 3rd and 4th gears, but it may happen with others. It does not happen at all...

Need to replace the not so great e fan on my Comanche. Anyone have a stock one in decent shape?

Decided to keep. Can I close my own thread or does a mod have to do that?

Thanks

Bought this a few months ago with the intention of going up to 4.10 gears but I have since reconsidered. High pinion version with 4.10 gears. In good shape. Comes with rotors and calipers as well. $300 https://ibb.co/ko2Wkk https://ibb.co/gKwDy5 (bigger pics here)

Anybody have a non-leaking, good shape NP231 in the So Cal area? I have a 91 Comanche, AX-15 transmission.

Thanks for the tip. In the industry I work in I'm very familiar with Timken, so that is probably the kit I will go with.

Found a mini console. Still interested in a fuel sending unit if anyone has one. Thanks!

Hello. The MJ's transfer case works well, but it leaks. Probably needs an overhaul. Can anyone recommend a good quality kit? I'm seeing $90 dollar kits on Amazon and $250 dollar kits on Quadratec... any others I should be looking at?

Hi everyone! I'm officially in the Jeep club now, having purchased a 1991 Longbed 4x4 MJ a few nights ago. Excited to start making improvements. The A/C wasn't working but thanks to my friend it turned out to be a quick and easy fix. A couple cans of Freon and I was in business. The...

Thanks David! I wasn't going to name drop here at NAXJA like we do in Panamint, lol. It's just nice having friends in high places, you know? :D The good thing about my situation is I'm not in a big rush for this to happen. I have a 4x4 rig that can do pretty much anything I feel...